Selenium and Firefox on Ubuntu: focusing to the new tab - selenium

Question

I am working on Selenium and Firefox in Ubuntu14.04. I created a new tab by send_keys(Keys.CONTROL + 't'), but keep giving commands on the first tab, maybe because I didn't focus on the new tab correctly.
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.keys import Keys
driver = webdriver.Firefox()
main_window = driver.current_window_handle
driver.get("https://www.google.com")
driver.find_element_by_tag_name('body').send_keys(Keys.CONTROL + 't')
driver.switch_to_window(main_window)
driver.get("http://www.bing.com")
driver.find_element_by_tag_name('body').send_keys(Keys.CONTROL + 't')
driver.switch_to_window(main_window)
driver.get("https://github.com/login")
There is no error while running this code.
I make a new tab after go to google.com, and the screen changes to a blank page on the new tab. After that, I wrote driver.switch_to_window(main_window) to focus on the new tab to make sure next lines of code will happen on the new tab. But as driver.get("http://www.bing.com") is executed, screen goes back to the first tab where google.com is present, and changes google.com to bing.com. Same thing for the next code. Another new tab created, but goes back to first tab as driver.get("https://github.com/login") executed and bing.com becomes github.com/login.
I thought I focused on the current visible tab by
main_window = driver.current_window_handle; driver.switch_to_window(main_window),
But this didn't work well.
How can I load all 3 webpages on 3 different tabs?
SPECIFICATIONS:
Selenium 3.0.2
firefox 45.0.1
Ubuntu 14.04 amd 64bit
python 2.7.6

Answer 1

Please try following solution and let me know if it's not what you're actually looking for:
driver.get("https://www.google.com")
google_window = driver.current_window_handle # Define main window
driver.execute_script("window.open('http://www.bing.com')") # Open Bing window
bing_window = [window for window in driver.window_handles if window != google_window][0] # Define Bing window
driver.execute_script("window.open('https://github.com/login')") # Open GitHub window
github_window = [window for window in driver.window_handles if window not in [google_window, bing_window]][0] # Define GitHub window
After all 3 windows opened you can simply navigate as:
driver.switch_to_window(bing_window)
...# do something
driver.switch_to_window(google_window)
...# do something
driver.switch_to_window(github_window)